[alsa-devel] [PATCH 2/4] ASoC: mmp: add audio dma support

[Vinod Koul]

On Tue, 2012-05-29 at 13:14 +0800, zhangfei gao wrote:
> 
> When debugging with putting snd_dmaengine_pcm_open to probe or
> pcm_new, there is issue.
> snd_dmaengine_pcm_open ->
> snd_pcm_hw_constraint_integer(substream->runtime,
> 
> SNDRV_PCM_HW_PARAM_PERIODS);
> The runtime is only exist at runtime.
> So if using soc-dmaengine, I am afraid the snd_dmaengine_pcm_open has
> to be put in open instead of probe. 
I think you got it wrong, the snd_dmaengine_pcm_open needs to be called
from your CPU pcm_open. See other examples how this is used in other
drivers.

-- 
~Vinod